Perform updates

5.3. Perform updates#

Nubus for UCS updates follow a structured process that ensures system stability and consistency. Before and after each update, special scripts run to validate the system and perform necessary cleanup. Understanding these scripts helps you troubleshoot issues and ensures smooth updates across your infrastructure.

For information about UCS version numbering and release types, see Nubus for UCS versioning.

5.3.1. Understand pre-update checks#

The pre-update script preup.sh runs before every release update to perform critical validation to ensure the system is ready for the update and that the update can complete successfully.

What it does

The preup.sh script checks for potential problems that could prevent a successful update or cause system instability. If it detects issues, it cancels the update in a controlled manner to protect your system. Among these checks are the following:

  • Disk space availability on essential file systems.

  • Package state consistency.

  • LDAP schema and connectivity validation.

  • Machine account credentials validation.

  • System compatibility checks.

  • Version compatibility across systems in the domain.

What happens if it fails

When preup.sh detects a problem, it reports the issue and stops the update process. This controlled interruption is preferable to an incomplete update that could compromise system stability. Review the error messages to identify and fix the underlying problem.

5.3.2. Understand post-update cleanup#

The post-update script postup.sh runs at the end of each update to perform necessary cleanup operations and ensure your system is fully consistent with the new version.

What it does

The postup.sh script performs cleanup and verification tasks after the update completes. These operations ensure the system is in a stable, consistent state and all changes are properly integrated. Common cleanup operations include the following:

  • Removing temporary installation files and backup package sources.

  • Restarting the firewall and Management UI for connectivity.

  • Updating system information in the LDAP directory.

  • Running role-specific configurations.

  • Removing deprecated package configurations.

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